package org.linlinjava.litemall.wx.util;

/**
 * @ProjectName: diesa_server
 * @Package: com.tmxk.diesa.utils
 * @ClassName: AesCbcUtil
 * @Author: Administrator
 * @Description: ${description}
 * @Date: 2019/6/26 0026 16:40
 * @Version:
 */
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;

/**
 * Created by yfs on 2017/2/6.
 * <p>
 * AES-128-CBC 加密方式
 * 注：
 * AES-128-CBC可以自己定义“密钥”和“偏移量“。
 * AES-128是jdk自动生成的“密钥”。
 */
public class AesCbcUtil {


  static {
    //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
    Security.addProvider(new BouncyCastleProvider());
  }

  /**
   * AES解密
   *
   * @param data           //密文，被加密的数据
   * @param key            //秘钥
   * @param iv             //偏移量
   * @param encodingFormat //解密后的结果需要进行的编码
   * @return
   * @throws Exception
   */
  public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
//        initialize();

    //被加密的数据
    byte[] dataByte = Base64.decodeBase64(data);
    //加密秘钥
    byte[] keyByte = Base64.decodeBase64(key);
    //偏移量
    byte[] ivByte = Base64.decodeBase64(iv);


    try {
      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

      SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

      AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
      parameters.init(new IvParameterSpec(ivByte));

      cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

      byte[] resultByte = cipher.doFinal(dataByte);
      if (null != resultByte && resultByte.length > 0) {
        String result = new String(resultByte, encodingFormat);
        return result;
      }
      return null;
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    } catch (NoSuchPaddingException e) {
      e.printStackTrace();
    } catch (InvalidParameterSpecException e) {
      e.printStackTrace();
    } catch (InvalidKeyException e) {
      e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
      e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
      e.printStackTrace();
    } catch (BadPaddingException e) {
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }

    return null;
  }

}
